Steps to Reproduce:
Open any page on MW version 1.34 with Translate extension installed
A warning appears stating that:
Warning: Use of undefined constant MW_VERSION - assumed MW_VERSION (this will throw an Error in a future version of PHP) in /MediaWiki/mlebtesting/core/extensions/Translate/TranslateHooks.php on line 49
No warning should appear.
This issue will happen on MLEB 2020.07 with MW 1.34 but was not noticed since we did not have notices enabled on the test server.